What is the hottest month in Bonsall, CA?

August is the warmest month, with a normal high of 81°F at Vista.

What is the coldest month in Bonsall, CA?

December is the coldest month, with a normal low of 45°F.

What is the wettest month in Bonsall, CA?

February has the most precipitation on average, about 3.12 inches.

Checked Oct 25, 2026

Bonsall, CA Climate

1991 to 2020 normals at Vista, 3.3 mi from the center of Bonsall, elevation 430 ft.

Average weather by month

Select a month for daily normals and last year's weather

Month	High	Low	Precip.	Snow
January	66°	46°	2.85 in	--
February	65°	46°	3.12 in	--
March	67°	48°	2.11 in	--
April	69°	50°	0.96 in	--
May	71°	55°	0.35 in	--
June	75°	59°	0.09 in	--
July	79°	62°	0.10 in	--
August	81°	63°	0.03 in	--
September	81°	61°	0.16 in	--
October	76°	56°	0.59 in	--
November	71°	50°	1.09 in	--
December	65°	45°	1.94 in	--
Year	72°		13.39 in	--

Frequently asked questions

What is the hottest month in Bonsall, CA?: August is the warmest month, with a normal high of 81°F at Vista.
What is the coldest month in Bonsall, CA?: December is the coldest month, with a normal low of 45°F.
What is the wettest month in Bonsall, CA?: February has the most precipitation on average, about 3.12 inches.

Today

Bonsall, CA forecast

Data sources

U.S. Climate Normals 1991-2020NOAA National Centers for Environmental Information
U.S. Climate Normals 1991-2020 (daily) and GHCN-Daily via Access Data ServiceNOAA National Centers for Environmental Information

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About this data

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Climate normals are 30-year averages measured at one weather station, which may be miles from the place named here or at a different elevation.

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